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Radio Buttons control in Android


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Radio Buttons control in Android

In this article, I am going to explain how to create two mutually-exclusive (in a group) radio buttons (enabling one disables the other), using the RadioGroup and RadioButton widgets. When either radio button is pressed, a toast message will be displayed.

·         Start a new project, named RadioButtonDemo.

·         Open the res/layout/main.xml file and add two RadioButtons, nested in a RadioGroup (inside the LinearLayout):

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent">

 

   <RadioGroup android:layout_width="fill_parent"

                android:layout_height="wrap_content"

                android:orientation="vertical" >

              <RadioButton android:id="@+id/radio_male"

                            android:layout_width="wrap_content"

                            android:layout_height="wrap_content"

                            android:text="Male"/>

              <RadioButton android:id="@+id/radio_female"

                            android:layout_width="wrap_content"

                            android:layout_height="wrap_content"

                            android:text="Female"/>

   </RadioGroup>

</LinearLayout>

 

·         Now when each RadioButton is selected, you need a View.OnClickListener. so add the following code in the Activity:

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.RadioButton;

import android.widget.Toast;

 

public class RadioButtonActivity extends Activity {

      

       private OnClickListener radioListener= new OnClickListener() {

              public void onClick(View v) {

                     RadioButton rb=(RadioButton)v;

                     Toast.makeText(RadioButtonActivity.this, rb.getText(),
                                                          Toast.
LENGTH_SHORT).show();

              }

       };

      

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        final RadioButton radioMale=(RadioButton)findViewById(R.id.radio_male);

        final RadioButton radioFemale=(RadioButton)findViewById(R.id.radio_female);

        radioMale.setOnClickListener(radioListener);

        radioFemale.setOnClickListener(radioListener);

    }

}

·         Run the application
Your output is something like below:

Radio Buttons control in Android

When any radio button is selected by the user, the radiobutton text will display in the toast message.


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